A device that transforms electrical energy to mechanical energy is a
A) generator.
B) motor.
C) transformer.
D) magnet.
E) none of the above
B
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Which of these shapes of equal height has the lowest center of gravity?
A. Sphere. B. Cube. C. Cone resting on its base. D. all the same
If an electrical tea kettle requires 1500 watts to heat, how many kilowatts does this equal?
A) 1.5 × 103 kw B) 1.5 kw C) 1,500,000 kw D) 15,000 kw E) cannot be determined from the data provided
Which of the following would NOT be likely if global warming continues?
a. more intense rainfall and more serious droughts in semi-arid regions b. a rise in temperatures in most polar regions c. expansion of the ranges of tropical diseases into higher latitudes d. a general lowering of mean sea level e. changes in ocean currents resulting from changes in salinity
The advantage for fishers to choose a population that feeds close to the primary producing population is that ________
A) energy transfer between trophic levels is inefficient and this will increase the available biomass B) they will be close to shore so it is easier to fish those regions C) it is easier to recover more biomass from the fish because they have not wasted energy swimming after food D) there will be a bigger variety of food available in those locations because there will be several trophic levels available E) none of the above